Measurement platform must exhibit a stereoscopic space distribution in diagnostic systems for petawatt lasers to meet the requirement of a periodically poled lithium niobate (PPLN) crystal for light polarization in singlepulse contrast measuring instrument. A mathematical model of a 4D linear matrix is proposed to achieve rapid and accurate beam alignment in picosecond measurement platform. In the petawatt experiments, the alignment algorithm ensures that the near-field and far-field accuracy is less than 0.16 mm and 0.17 mrad, respectively. The motor is adjusted less than three times, and the corresponding elapsed time is in 2 min. The mathematical model meets measurement requirements for alignment accuracy and time. The pulse contrast of the petawatt lasers is obtained from the model. The pulse acquisition probability of the contrast measuring instrument reaches 90% from 10%, to guarantee that the experimental result of pulse contrast can meet the general requirement (more than 106).

拍瓦激光参数诊断过程中，为满足单脉冲信噪比测量仪中周期性极化铌酸锂(PPLN)晶体对光束偏振态的要求，皮秒测量平台的光路排布中采用了立体空间分布结构。针对单脉冲信噪比测量仪快速精确的在线准直要求，推导出马达调整的4×4 维线性矩阵的数学模型算法，实现皮秒测量平台立体空间激光光路的快速精确准直。实验结果表明，该准直算法能够保证马达调整3次以下，准直时间2 min以内，实现近场准直精度小于0.16 mm，远场调整精度小于0.17 mrad。满足信噪比测量对准直精度和准直时间的要求，使得信噪比信号获取成功率由10%提升到90%，保障拍瓦激光信噪比实验结果满足总体要求(大于106)。

光路自动准直系统用于高功率固体激光装置光路自动调整,确保从预放注入的光束准确地通过主放大级光路到达靶点,准直算法和流程控制是光路自动准直的两项关键技术。针对神光-Ⅲ原型装置光路自动准直系统的腔镜准直算法,基于图像处理技术,提出了基于空间滤波小孔图像信号区域面积最大,长短轴控制以及x,y轴长度控制3种算法。在原型装置上开展的实验表明,x,y轴长度控制算法最有利于准直闭环控制的实现,其准直精度优于90 μm。在自适应波前校正系统完成波前预校正后,针对灰度分布变化的远场图像,再使用光路自动准直系统,对光束远场重新准直定位。结果表明,优化后的准直流程可以消除波前预校正对光束远场定位的影响。